References: Registers, Counters, and Datapath
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Shift register - Wikipedia - Detailed coverage of shift register types, ring counters, and Johnson counters with applications.
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Counter (digital) - Wikipedia - Comprehensive overview of binary counters, ripple counters, and synchronous counters.
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Ring counter - Wikipedia - Explanation of ring and Johnson counter configurations.
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Digital Design (6th Edition) - M. Morris Mano and Michael Ciletti - Pearson - Chapter 8 covers registers, shift registers, counters, and datapath components.
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Shift Registers - Electronics Tutorials - Comprehensive tutorial on SISO, SIPO, PISO, PIPO configurations and universal shift registers.